From 2de67fe09163c902801dcdca600bacd09e3d9bf8 Mon Sep 17 00:00:00 2001
From: indifferentketchup <samkintop@gmail.com>
Date: Fri, 15 May 2026 15:37:02 +0000
Subject: [PATCH] batch3 T6 typing fix: inline narrowing for body.state guard

Boolean indirection (const stateOnly = ...; if (stateOnly)) didn't carry
the narrowing to body.state inside the branch. Inline the check so
TypeScript narrows correctly and the explicit cast on pendingState
becomes unnecessary.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 apps/web/src/hooks/usePanes.ts | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/apps/web/src/hooks/usePanes.ts b/apps/web/src/hooks/usePanes.ts
index 0f4481b..c17217c 100644
--- a/apps/web/src/hooks/usePanes.ts
+++ b/apps/web/src/hooks/usePanes.ts
@@ -78,9 +78,8 @@ export function usePanes(sessionId: string | undefined): {
 
   const update = useCallback(
     async (id: string, body: PaneUpdateRequest): Promise<void> => {
-      const stateOnly = body.state !== undefined && body.position === undefined;
-
-      if (stateOnly) {
+      if (body.state !== undefined && body.position === undefined) {
+        const nextState = body.state;
         // Optimistic local update
         setPanes((prev) => {
           if (!prev) return prev;
@@ -90,10 +89,10 @@ export function usePanes(sessionId: string | undefined): {
             changed = true;
             // Narrow via discriminated union to satisfy TypeScript
             if (pane.kind === 'chat') {
-              return { ...pane, state: body.state as typeof pane.state };
+              return { ...pane, state: nextState as typeof pane.state };
             }
             if (pane.kind === 'file_browser') {
-              return { ...pane, state: body.state as typeof pane.state };
+              return { ...pane, state: nextState as typeof pane.state };
             }
             return pane;
           });
@@ -101,7 +100,6 @@ export function usePanes(sessionId: string | undefined): {
         });
 
         // Coalesce: last state wins within debounce window
-        const nextState = body.state;
         pendingState.current.set(id, nextState);
 
         if (debounceTimer.current !== null) {